KETEP 세계에너지시장정보

1. A back-contact battery, characterized by, including:silicon substrate, the back of the silicon substrate has a plurality of first polarity regions and a pl ra of second polarity regions arranged alternately;the first tunneling layer and the first doping layer are arranged in succession on the first polar region, the first tunneling layer comprises a first nitride layer, and a plurality of holes are formed on the first tunneling layer; Withthe second tunnel layer and the second doping layer arranged on the second polar region are sequentially superimposed;wherein, the surface of the first polar region is suede, the first polar region has a plurality of first pyramid structures, the first pyramid structure has a first tower base bevel, and the first tower foundation inclined surface comprises the first area, the second area and the third area arranged sequentially along the bottom of the first pyramid structure towards the top of the first pyramid structure, and the second area is located between the first area and the third area, The hole density of the part of the first tunnel layer located on the third area is greater than that of the part of the first tunnel layer located on the second area.